JPH0630140U - Heat-insulating adhesive sheet - Google Patents

Abstract

(57) [Abstract] [Purpose] Providing highly reliable heat insulating material that can easily perform heat insulating work on piping, especially heat insulating material that occurs on the peripheral joint of prefabricated heat insulating piping where the heat insulating material layer is pre-coated on the pipe. Provides optimal insulation for coating over butt seams of layers. The heat-insulating adhesive sheet (10) comprises a metal thin plate (12) as a laminated tape (11), a foamed polyolefin heat insulating material layer (14) adhered to at least one surface of the metal thin plate, and a foamed polyolefin. It comprises a pressure-sensitive adhesive layer (16) formed only on one of the surfaces of the heat insulating material layer facing the surface on which the thin metal plate is adhered. The metal thin plate has a thickness capable of shaping the laminate tape into a desired shape and maintaining the shaped shape.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat insulating adhesive sheet used as a heat insulating material for pipe coating, and more specifically to a disconnecting portion of a heat insulating material coating layer generated at a connection joint of a heat insulating material coated prefabricated pipe used for a medium pipe of an air conditioner. This relates to an optimal heat-insulating adhesive sheet as a heat-insulating material for complementing.

[0002]

[Prior art]

 In order to save labor in the work of covering the insulation material at the construction site in the heat insulation work of the piping, especially for the heat insulation work of small diameter pipes, recently, the insulation material covered prefabricated pipe (hereinafter , Adiabatic piping) is used more and more. For example, in the installation work of air-conditioning equipment or air-conditioning equipment, the piping that connects the outdoor compressor and the indoor heat exchanger should be insulated with a heat insulating material on the outer circumference of the piping to maintain the temperature of the medium flowing inside the piping. It must be covered and insulated from the outside world. For piping requiring such insulation work, a so-called prefabricated heat-insulating copper pipe in which a copper pipe is coated with a heat insulating material such as a polyolefin foam cylinder at the factory stage, for example, a copper pipe having a length of 2 to 4 m and a polyolefin foam having a thickness of about 10 mm are used. Insulated copper tubing coated with cylindrical insulation is often used. FIG. 5 is a perspective view showing a typical example of the heat insulating pipe A. In the figure, B is a copper tube, and C is a polyolefin foam cylindrical heat insulating material.

At a site where piping for connecting an outdoor compressor and an indoor heat exchanger is constructed, end faces of a heat insulating copper pipe having a length of 2 m to 4 m are brazed to each other and extended to a desired length. When brazing, the heat insulating material covered with the copper pipe is wound at the end for the required length, the end of the copper pipe is exposed, and brazing is performed. After connecting the copper pipes, the wound heat insulating material is returned to its original state, and the exposed end portions of the copper pipes that are exposed by abutting the heat insulating materials are covered again with the heat insulating material. The butt seams are then generally wrapped from the top with vinyl chloride tape to finish.

[0004]

[Problems to be solved by the device]

 By the way, when the use of the air conditioner is started, the medium is used as a heat medium in winter, so the temperature of the pipe rises to about 110 ° C, and the polyolefin insulation material coated on the pipe shrinks by about 1%. . Therefore, a gap of about 40 mm per 4 m is created at the butt joint of the heat insulating material, and the heat insulating effect is reduced. On the contrary, since the medium is used as a refrigerant in the summer, the pipe temperature is about -5 ° C to 10 ° C. As a result, water vapor enters the exposed pipes through the gaps in the heat generated in the winter, causing dew condensation, and the liquid pick-up drops from the pipes, causing problems such as getting people's clothes and the floor wet. Met.

At the time of construction, the vinyl chloride tape is wound around the butt joint of the polyolefin foam insulation material to a width of about 80 mm as described above, but the vinyl chloride tape alone cannot prevent this trouble. It was This is because the tape cannot prevent a gap from occurring at the end of the abutting heat insulating material due to the contraction of the length of the heat insulating material, and the tape covering the resulting gap lacks the heat insulating function. This is because dew condensation occurs on the top. As an alternative method, it has been attempted to wrap a tape having a thickness of 4 mm to 8 mm with a pressure-sensitive adhesive applied to one surface of a polyolefin insulation sheet over a butt joint of the insulation material for a width of about 80 mm. Due to the strong repulsive force of the foam and the decrease in the adhesive effect due to the heat from the piping at 110 ° C, the tape was peeled off and it was not useful for preventing dew condensation.

Although the problem of the butt joint of the heat insulating material of the heat insulating pipe has been described above by taking the connection pipe of the air conditioner as an example, even if the heat insulating pipe is used in other equipment or in another place, Since the temperature is naturally affected by repeated operation and stoppage of the equipment, a gap is created in the heat insulating material layer as in the air conditioner piping, and there was the problem of dew condensation and deterioration of the heat insulating effect. Therefore, in order to solve the above problems of heat insulating piping and save the work of heat insulating material coating at the construction site, it is possible to easily cover the butt joint of the heat insulating material layer of the heat insulating piping, and to obtain the heat insulating effect. It was required to provide high thermal insulation. Further, not only the heat insulating material layer applied to the prefabricated heat insulating piping but also the heat insulating material layer applied to the piping is generally relatively weak against mechanical external force and easily damaged or peeled off. Therefore, there is a problem that the pipe is exposed, the heat insulation effect is reduced, and there is a risk of burns due to contact with the exposed pipe.Therefore, it is necessary to repair the damaged part, but conventionally there is no heat insulating material that can be easily repaired. It was. Therefore, it has been demanded to provide a heat insulating material that can easily repair such a damaged portion of the heat insulating material.

An object of the present invention is to provide a heat insulating material that can be easily heat-insulated for piping and can also be used for repairing the heat insulating material, especially for a prefabricated heat insulating pipe in which a heat insulating material layer is pre-coated. It is an object to provide an optimum heat insulating material for covering the butt joint of the heat insulating material layer generated in the peripheral joint portion.

[0008]

[Means and Actions for Solving the Problems]

 In order to achieve the above object, a heat-insulating adhesive sheet according to the present invention comprises a metal thin plate, a foamed polyolefin heat insulating material layer adhered to at least one surface of the metal thin plate, and a metal thin plate of the foamed polyolefin heat insulating material layer. A laminate tape comprising a pressure-sensitive adhesive layer formed only on one of the surfaces facing the adherend, and a thin metal plate bends the laminate tape into a desired shape, and forms the desired shape. It is characterized by having a thickness that can be retained.

In the heat-insulating adhesive sheet according to the present invention, the thin metal plate suppresses the deformation repulsive force of the foamed polyolefin, deforms the laminated tape into a desired shape along its longitudinal direction, and holds it in that shape. Serves as a core for. The type of metal of the thin metal plate is not particularly limited as long as it has flexibility and shape retention, but a metal having high corrosion resistance such as a copper plate, an aluminum plate, a lead plate, and a stainless steel plate is desirable.

The type and thickness of the foamed polyolefin heat insulating material are not particularly limited, and a desired kind of foamed polyolefin heat insulating material having a desired thickness can be used. For example, for heat-insulated piping covered with foamed polyethylene insulation, use foamed polyethylene insulation with a thickness approximately equal to that of the heat-insulated piping. The method for applying the foamed polyolefin heat insulating material layer to the thin metal plate is a conventional method. The adhesive layer is provided to adhere the heat-insulating adhesive sheet to a desired place so that it does not easily move.For example, the heat-insulating adhesive sheet is wound around the butt joint of the heat-insulating material layer of the heat-insulating pipe once more. In that case, the adhesive layer adheres to the surface of the heat insulating material layer of the heat insulating pipe, and then to the surface of the heat insulating adhesive sheet wound in the last overlapping portion. The pressure-sensitive adhesive layer is formed by depositing a known pressure-sensitive adhesive on the foamed polyolefin heat insulating material layer by a conventional method.

The thickness of the metal thin plate is required to bend the laminated tape into a desired shape and maintain the shape, and the mechanical strength such as the plastic deformation strength of the metal thin plate and the bending strength of the foamed polyolefin is required. It is a dimension of a property that is determined according to the physical properties and based on the desired thickness of the foamed polyolefin layer. The thickness of the metal thin plate can be easily determined by preparing a sample using the desired foamed polyolefin and the metal thin plate and evaluating the shape retention.

The heat-insulating pressure-sensitive adhesive sheet according to the present invention, as will be described in the following use example, is wound by a desired number of layers on the butt joints of the heat insulating material layers of the heat insulating piping to form the butt joint portions of the heat insulating material. Used to complete heat insulation, or used for repairing by winding spirally while partially overlapping in the circumferential direction on the pipe exposed by peeling the heat insulating material, and for heat insulation of the pipe It can be used for various purposes such as.

[0013]

【Example】

 Hereinafter, the present invention will be described in more detail based on embodiments with reference to the accompanying drawings. FIG. 1 is a perspective view schematically showing an embodiment of the heat insulating adhesive sheet according to the present invention. As shown in FIG. 1, a heat-insulating adhesive sheet 10 according to the present invention is used as a laminate tape 11 and a metal thin plate 12 and a foamed polyolefin heat insulating material layer 14 adhered to at least one surface of the metal thin plate 12. And a pressure-sensitive adhesive layer 16 formed on the surface of the foamed polyolefin heat insulating material layer 14 that faces the metal thin plate adhered side. Here, FIG. 1A shows an embodiment of a heat-insulating adhesive sheet 10 in which a foamed polyolefin heat insulating material layer 14 is adhered only on one surface of the metal thin plate 12, and in FIG. 1B, both of the metal thin plates 12 are shown. An example of a heat-insulating pressure-sensitive adhesive sheet 10a having a foamed polyolefin heat insulating material layer 14 adhered to its surface is shown. In this embodiment, a release paper 18 is attached on the adhesive layer 16 to protect the adhesive layer 16. FIG. 1 shows a state in which the edge of the release paper is slightly peeled off.

FIG. 2 is a perspective view showing an example of usage of the heat insulating adhesive sheet 10 shown in FIG. The heat-insulating adhesive sheet 10 used in this example is a 100 μm thick aluminum thin plate as the metal thin plate 12, a 30-fold foamed polyethylene foam layer having a thickness of 5 mm as the foamed polyolefin heat insulating material layer 14, and an acrylic adhesive as the adhesive layer 16. Is a tape having a width of 100 mm, which is composed of a layer having a thickness of 30 μm. In FIG. 2, the heat-insulating adhesive sheet 10 described above is wound in one layer on the butt joint of the heat-insulating material B of the heat-insulating pipe A, and finally forms a short overlapping portion. Here, the heat insulation pipe A used as the refrigerant pipe is a copper pipe C having an outer diameter of 25.4 mm and a length of 4 m, and a heat insulation material B having a thickness of 10 mm and an inner diameter of 26 mm, which is made of a polyethylene foam cylinder with 30 times expansion. This is prefabricated heat insulation piping.

In the use example shown in FIG. 2, heated silicone oil was flown into the copper pipe C of the heat insulating pipe A to maintain the surface temperature of the copper pipe at 110 ° C. for 168 hours. During the first 5 hours maintained at 110 ° C., heat shrinkage created a gap of length 35 mm at the butt seam of the insulation layer B located under the heat-insulating adhesive sheet 10. After maintaining the surface temperature of the copper pipe at 110 ° C. for 168 hours, the heat insulating pipe A was placed in a state where the atmospheric temperature was 30 ° C. and the relative humidity was 60% (condensation at 5 ° C.). In this state, the cooling water at 5 ° C was continuously flown through the copper pipe C of the heat insulating pipe A, but no dew condensation was formed on the heat insulating adhesive sheet 10 or the foam polyethylene heat insulating material layer in the vicinity.

FIG. 3 is a perspective view showing an example of use of the heat-insulating adhesive sheet 10a shown in FIG. 1 (b). The heat insulating adhesive sheet 10a used in this example is a lead thin plate having a thickness of 300 μm as the metal thin plate 12, and a 40-fold expanded polyethylene foam layer having a thickness of 5 mm adhered to both surfaces of the metal thin plate 12 as the foamed polyolefin heat insulating material layer 14. The adhesive layer 16 is a tape having a width of 50 mm, which is made of a layer in which an acrylic adhesive is formed to a thickness of 30 μm. In FIG. 3, the heat-insulating adhesive sheet 10a described above covers the bare steel pipe (GP-32A) D as a heat insulating material so as to be wound in a spiral shape while partially overlapping in the circumferential direction.

A dew condensation test similar to that of the use example shown in FIG. 2 was performed on the use example of FIG. 3, but no dew was formed on the heat insulating pressure-sensitive adhesive sheet 10a. Even if the surface temperature of the pipe reaches 110 ° C, the heat-insulating adhesive sheet 10a is spirally wound so as to partially overlap in the circumferential direction and tightly adhered to each other. It was confirmed that no gap was formed in the heat insulating material layer between the one roll of the heat insulating adhesive sheet 10a and the one roll wound adjacent to the heat insulating adhesive sheet 10a despite the temperature rise of the heat insulating pipe. This example shows that the heat-insulating adhesive sheet 10a can be used as a heat-insulating material that is easy to install and highly reliable even when heat-insulating the exposed surface of a relatively long pipe.

Further, when water was passed through the same bare steel pipe as the steel pipe D used in FIG. 3 at a constant flow rate, there was a running noise of 17 decibels, but the heat insulating adhesive sheet 10a shown in the usage example of FIG. When water of the same flow rate was passed through the steel pipe D coated with, the running noise was reduced to 3 decibels. Therefore, it is shown that the heat-insulating adhesive sheet 10a of this use example functions as a soundproof tape which is easy to install.

FIG. 4 is a perspective view showing another example of use of the heat insulating adhesive sheet 10 shown in FIG. The heat-insulating adhesive sheet 10 used in this example is an aluminum plate having a thickness of 0.5 mm as the metal thin plate 12, and an inorganic material having a thickness of 8 mm applied to one surface of the metal thin plate 12 as the foamed polyolefin heat insulating material layer 14. A tape with a width of 70 mm, which is composed of a filled plastic foam layer (using Funen Ace, trade name, manufactured by Furukawa Electric Co., Ltd.) and a layer of a flame-retardant acrylic adhesive having a thickness of 30 μm formed as the adhesive layer 16. Is. In FIG. 4, the above-mentioned heat-insulating adhesive sheet 10 is coated as a heat insulating material on a bare copper pipe E having an outer diameter of 25.4 mm so as to be wound in a spiral shape while partially overlapping in the circumferential direction.

A dew condensation test similar to that of the use example shown in FIG. 2 was performed on the use example of FIG. 4, but no dew was formed on the heat insulating pressure-sensitive adhesive sheet 10. Even if the surface temperature of the pipe reaches 110 ° C, the heat-insulating adhesive sheet 10 is wound in a spiral shape by winding it in a spiral shape so as to partially overlap in the circumferential direction and closely adhering to each other. It was also confirmed that no gap was formed in the heat insulating material layer between one roll of the heat insulating adhesive sheet 10 and one roll wound adjacent to the heat insulating adhesive sheet 10 despite the temperature rise of the heat insulating pipe. This example shows that the heat-insulating adhesive sheet 10 can be used as a heat insulating material that is easy to install and has high reliability when heat-insulating an exposed surface of a relatively long pipe, like the heat-insulating adhesive sheet 10a. .

Next, the following ignition test was performed on the heat-insulating adhesive sheet-coated tube of the use example of FIG. A candle with a core length of about 10 mm and a thickness of about 20 mm was burned with a flame length of 50 mm or more and a flame thickness of about 7 mm, and this was used as a fire source. The heat-insulating adhesive sheet 10 was exposed to the flame for 30 seconds with the center of the flame of the candle positioned at the lower end of the covered tube inclined at 45 °, but it did not ignite. This ignition test shows that the heat-insulating adhesive sheet according to the present invention has flame resistance and does not easily ignite.

In the above usage examples, the method of using the heat-insulating adhesive sheet according to the present invention has been described by taking piping as an example, but it can be used for heat insulating construction of objects to be heat-insulated of various shapes, not limited to piping.

[0023]

[Effect of device]

 According to the present invention, the heat-insulating adhesive sheet is composed of a laminated tape provided with a metal thin plate, a foamed polyolefin heat insulating material layer, and an adhesive layer, and the metal thin plate is desired to have the laminated tape along its longitudinal direction. By being bent into a shape and having a thickness capable of maintaining the desired shape, a heat insulating material that is easy to install, highly reliable, and flame resistant is realized. By winding this heat-insulating adhesive sheet in the circumferential direction of the pipe, it is extremely easy to apply the heat-insulating material to the pipe, and even if the heat-insulating material is peeled off or damaged, the heat insulation of the pipe can be performed. The damaged part of the material can be easily repaired. In particular, the heat-insulating adhesive sheet according to the present invention is optimal as a heat-insulating material that can be easily coated on the butt joint of the heat-insulating material layer that occurs in the peripheral joint portion of the prefabricated heat-insulating piping in which the heat-insulating material layer is pre-coated on the piping. .

[Brief description of drawings]

1 (a) and 1 (b) are perspective views of an embodiment of a heat insulating adhesive sheet according to the present invention and another embodiment, respectively.

FIG. 2 is a perspective view of a usage example using the embodiment shown in FIG.

FIG. 3 is a perspective view of a usage example using another embodiment shown in FIG. 1 (b).

FIG. 4 is a perspective view of another usage example using the embodiment shown in FIG.

FIG. 5 is a perspective view of a heat insulating pipe in which a pipe is coated with a heat insulating material in advance in a factory.

[Explanation of symbols]

 10 Example of heat-insulating adhesive sheet according to the present invention 10a Another example of heat-insulating adhesive sheet according to the present invention 11 Laminated tape 12 Metal sheet 14 Foamed polyolefin heat insulating material layer 16 Adhesive layer 18 Release paper A Heat insulating piping B Heat insulating material Layer C piping

Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B32B 7/06 9267-4F 15/08 103 7148-4F 27/00 M 7258-4F F16L 59/10

Claims (1)

[Scope of utility model registration request] 1. A metal thin plate (12), a foamed polyolefin heat insulating material layer (14) adhered to at least one surface of the metal thin plate, and a metal thin plate adhered surface of the foamed polyolefin heat insulating material layer facing each other. A laminate tape (11) having a pressure-sensitive adhesive layer (16) formed on only one of the surfaces, wherein the thin metal plate shapes the laminate tape into a desired shape,
Further, a heat-insulating adhesive sheet having a thickness capable of maintaining the shaped shape.